$4xy^3-4$
$15\cos x+1=0$
$-5+\left(-5n\right)+10$
$x^3-2x^2+3x-1\cdot2x+3$
$\left(y^4\right)^{-6}$
$-4x^2+2x-7$
$\frac{\frac{1}{25}}{\frac{1}{125}}$
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